Optical system

Details Optical system Optical system

1989-01-19

1990-08-21

Arnold, Bruce Y.

350 12, 350170, 350174, 350437, 350438, 350442, 350620, G02B 1708

Patent

active

049500562

ABSTRACT:
Catadioptric optical systems are generally arranged to view a fixed large field of view. Apparatus for steering a field of view includes a pair of Risley prisms, which are disc shaped prisms having a generally shallow wedge like side cross-section, arranged in the path of the incoming radiation. The prisms are rotatable with respect to each other and to the optical axis of the system so as to steer the field of view.
By utilizing such steering in a dual waveband system then a system having two fields of view and two magnifications may be achieved in which an image over a smaller field of view but of high magnification may be steered within a larger image of large field of view but low magnification.

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Pat. Abstracts of Jap., vol. #4, #24 (E-173), 29th Feb. 1980, p. 54, E173; JP-A-54, 161 982 (Mitsubishi Denki K.K.) 22-12-1979.

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